Prior to the User Principal Name (UPN) change you need to make sure to close all of your OneDrive notebooks. For details on how to do this, click this link to the official Microsoft instructions.
After the UPN change you will need to re-enter your username as shown in the example below. (Note: Your password will be the same as it was prior to the UPN change.) You will likely first encounter this when you open Outlook.
Old username: doej@ode.state.or.us
New username: doej@ode.oregon.gov
(Note: This change will NOT have any impact on your ODE Google username or password.)